Refillable cartridge-fuse.



J. F. OBERT.

REFILLABLE CARTRIDGE FUSE.

APPLICATION FILED JULY 20. 1915.

1 ,2]; 9,850. p Patented Mar. 20, 1917.

UNITED STATES PATENT ()FFICE.

JOHN F. OBERT, 0F LOS ANGELES, CALIFORNIA.

REFILLABLE CARTRIDGE-FUSE.

Application filed July 20, 1915.

To all whom it may concern:

Be it known that I, JOHN F. OBnn'r, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Refillable Cartridge-F uses, of which the following is a specification.

My invention relates to new and useful improvements in renewable cartridge fuses, the primary object of my invention being the provision of a novel and simple means for securin the fuse within the cartridge or shell which forms the protector for the fuse.

More specifically, my invention comprehends a "shell or casing of insulative material closed at its ends by contact heads to which the ends of the fuse are attached and which are secured in place by metallic ferrules or the contacts of the fuse.

In this connection, a still further object of my invention consists in the provision of a fuse supporting carriage connecting the contact heads and serving to iiiziintain them in proper spaced relation and so arranged that, upon removal of the clamping ferrules or caps, the carriage and heads, together with the fuse connected thereto, may be withdrawn from the shell to permit examination or replacement of the fuse.

In this connection, a still further object of my invention consists in providing means for connecting the contact he'ads to the carriage, which means also serve to properly center the carriage within the shell and hold it against turning movement during application of the clamping ferrules.

With these and other objects in view my invention will be more fully described, illustrated in the accompanying drawings, and then specifically pointed out in the claims which are attached to and form a part of this application.

In the drawings:

Figure 1 is a perspective view of a can tridge fuse constructed in accordance with my invention;

Specification of Letters Patent.

caps which, in some instances, form other by the carriage 13.

Patented Mar. 20, 1917.

Serial No. 41,007.

cated in all the views of the drawings by the same reference characters.

My present invention broadly comprehends a fuse of the cartridge type including an outer casing or shell 10 of insulating material, preferably fiber, clamping ferrules 11, contact heads 12, a carriage 13 connecting the contact heads, and a fuse 14 connected at its ends to the contact heads.

More specifically, the shell, 10 is preferably tubular in shape and provided at diametrically opposite points with longitudinally extending guide grooves or channels 15. The clamping heads include an externally threaded cylindrical body portion 16 somewhat less in diameter than the internal diameter of the shell 10 and carrying, at one end, a contact blade 17 and formed at its opposite end with a reduced cylindrical extension 18, the free end of which is cut-away at an angle to provide a clamping seat 19. These contact heads are, of course, formed of some suitable electrical conductor, such as brass and are held in proper spaced relation with their seats 19 opposed to each This carriage 13 includes an intern'lediate, transversely arcuate body portion 20 provided at its ends with tubular sleeve portions 21 adapted to encircle the extensions 18 of the heads 12 and to engage at their ends against the body portions If) of such heads. Each head is secured in its end of the carriage 20 by means of a pair of diametrically disposed screws 22 threaded throughthe sleeve portion of the carriage and into the head, these screws being preferably of that type known as fillister headed screws in order that their extended heads, which are cylindrical, may

.of the fuse ribbon and, consequently, secure the fuse to the contact heads, washers 2st being preferably interposed between the heads of the thumb screws and fuse to prevent injury to the fuse during application of the screws.

In assembling the ahove described fuse, the reduced terminals of the clamping heads are inserted in the sleeve portions of the carriage and secured .in place by the screws 22, after which the fuse leis secured to-the clamping heads. One clamping head is then placed in the end of the shell 10 and pres sure exerted against the other clamping head to force the entire carriage into the shell, the screws 22 passing along the guide grooves 15 during this operation. the carriage, with its clamping heads and fuse, has been properly positioned in the shell 10, the clamping ferrules 11 are threaded upon the body portions 16 of the clamping heads and brought into engagement with the ends of the shell. As shown, these ferrules are formed with flanges surrounding the ends of the shell 10 and with resultant shoulders which engage the ends of the shell when the ferrules are turned home. The entire carriage and clamping heads may be readily removed from the shell at any time for inspection by merely unthreading one of the ferrules and then drawing the carriage from the opposite end of the shell.

In Fig. 5 of the drawings, I have illustrated a slightly modified form of construction in which the clamping head 25 is formed without the contact blade portion 17 and in which the ferrules 26 are formed with closed outer ends 27 which engage against the free ends of the clamping heads, the ferrules or 'caps here shown forming contact sleeves for engagement with spring clip contacts.

Although I have illustrated and described my invention in all its details of construction, it will of course be understood that I do not wish to'limit myself to such details, as various minor changes, within the scope of the appended claims, may be made at any time, without in the slightest degree departing from the spirit'of my invention.

Having thus described the invention, what is claimed as new is:

1. A renewable fuse including a tubular shell provided with dian'ietrically disposed interiorly formed longitudinal grooves, contact heads insertilole in the ends of the shell,

When.

means connecting the heads and ei'lgaging the grooves to prevent turning of the heads with respect to-the shell, a fuse connecting the heads, and ferrules having threaded connection with the heads and engaging about the.ends of the shell.

2. A renewable fuse including a shell of insulating material formed interiorly with longitudinally extending grooves, a pair of contact heads having reduced portion adapted to projectwvithin the ends of the shell,

'a carriage of insulating material provided contact heads adapted to project into the ends of the shell, means for holding the heads against movement toward and away from each other and for engagement in the grooves to hold the heads against turning movement, means for securing the heads against displacement with respect to the shell and for closing the ends of the shell and a fuse connecting the heads.

1. A renewable fuse including an inner shell of insulating material provided throughout a portion of its length with a longitudinal opening, contact heads having reduced extensions projecting within the ends of the inner shell, fastening means extending through the wall of the inner shell and into the contact heads to connect the heads to the shell, the fastening means-projecting exteriorly of the inner shell. an outer shell formed throughout its length with longitudinal grooves to seat the extended portions of the fastening means, the contact heads being movable completely through the outer shell, ferrules connected to the contact heads and engaging against the ends of the outer shell to center the heads, and a fuse connecting the contact heads and disposed within the inner shell.

5. A renewable fuse including inner and outer shells, contact heads extending into the ends of the inner shell and proportioned for free movement through the outer shell, means connecting the heads to the inner shell and cooperating with the outer shell to hold the inner shell against turningmovement with respect to the outer shell. and

ferrules clamping the heads against longitudinal movement with respect to the outer shell.

(3. A renewable fuseincluding an outer shell formed throughout its length with an ing the contact heads, and ferrules secured internal longitudinal groove,acarria-gem0vto the contact heads and engaging about vable throughthe shell andhaving engagethe ends of the shell.

ment with the groove whereby it is held In testimony whereof I afiix my signature. against turning movement, contact heads supported by the carriage, a fuse connect- JOHN F. OBERT. [L8,] 

